Animal Science Abstract
The effect of change of the diet and feeding regimen at weaning on duodenal myoelectrical activity in piglet
V. Lesniewska1,2, H. N. Lærke1, M. S. Hedemann1, S. Højsgaard3, S. G. Pierzynowski1,4 and B. B. Jensen1
1Department of Animal Nutrition and Physiology, Danish Institute of Agricultural Sciences, Research Centre Foulum, PO Box 50, DK-8830 Tjele, Denmark2Department of Animal Physiology, Faculty of Veterinary Medicine, Warsaw Agricultural University, ul. Nowoursynowska 166, 02-787 Warsaw, Poland
3Department of Agricultural Systems, Danish Institute of Agricultural Sciences, Research Centre Foulum, PO Box 50, DK-8830 Tjele, Denmark
4R. and D. Gramineer International AB, Animal Physiology Department, IDEON, 223 70 Lund, Sweden
Abstract
This study investigated the effect of the change of diet and feeding regimen at weaning on myoelectrical activity of the intestine of piglets. For this purpose the electromyographic recordings of duodenal myoelectrical activity were carried out in relation to the different weaning status of piglets. Six piglets, in two experimental trials were surgically modified with two serosal, bipolar electrodes on the duodenum. The myoelectrical activity was recorded in the same piglets before weaning when they were sucking their sow and after weaning when the diet was changed to solid dry food (standard commercial concentrate for weaned pigs). In sucking piglets the intestinal myoelectrical activity pattern exhibited triple-phased migrating myoelectric complex (MMC), undisturbed by sow nursing. After weaning, feeding with solid food induced a long-term post-prandial pattern with higher frequency of electrical response activity (ERA) when compared with phase II of the MMC. The duration of the MMC cycles increased with time over the experiment by proportionately 0·11 and 0·14 in the periods before and after weaning. However, weaning significantly shortened MMC cycle duration by proportionately 0·21. The duration of phase II was significantly prolonged with time over the experiment by 0·07 to 0·10 and it was not affected by weaning. Phase III of MMC were of constant duration over the whole experimental period.
In summary, changes in the diet and feeding regimen have an influence on the characteristics of intestinal myoelectrical activity in piglets around weaning.
Keywords: duodenum, myoelectrical activity, piglets, sow milk
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